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The Ultimate High-Calorie Solution for Serious Weight Gain
If you have a fast metabolism or find it difficult to consume enough calories through whole foods alone, Optimum Nutrition Serious Mass is the tool you need to break through plateaus. Designed specifically for "hardgainers" and athletes in a heavy bulking phase, this nutrient-dense formula makes it easier to reach your caloric surplus and support your muscle-building goals.
Massive Calories for Maximum Results
Every serving of Serious Mass provides a staggering 1,250 calories (when mixed with water) and 50g of a multi-phase protein blend. With over 250g of carbohydrates per serving and no added sugar, this weight gainer provides the sustained energy needed to fuel intense training sessions and replenish glycogen stores. This 12lb bulk bag ensures you stay consistent with your nutrition, providing the foundation for serious size and strength.
Complete Muscle Support & Immune Health
Serious Mass isn't just about the calories—it’s about quality nutrition. This formula is fortified with 25 essential vitamins and minerals, including Vitamin C, Vitamin D, and Zinc, to support your immune system while you push your body to the limit. To further enhance your performance, each serving includes Creatine Monohydrate and Glutamine, helping to improve strength, power, and muscle recovery after every workout.
100% Authentic
Fast Shipping
14-Day Returns
The Ultimate High-Calorie Solution for Serious Weight Gain
If you have a fast metabolism or find it difficult to consume enough calories through whole foods alone, Optimum Nutrition Serious Mass is the tool you need to break through plateaus. Designed specifically for "hardgainers" and athletes in a heavy bulking phase, this nutrient-dense formula makes it easier to reach your caloric surplus and support your muscle-building goals.
Massive Calories for Maximum Results
Every serving of Serious Mass provides a staggering 1,250 calories (when mixed with water) and 50g of a multi-phase protein blend. With over 250g of carbohydrates per serving and no added sugar, this weight gainer provides the sustained energy needed to fuel intense training sessions and replenish glycogen stores. This 12lb bulk bag ensures you stay consistent with your nutrition, providing the foundation for serious size and strength.
Complete Muscle Support & Immune Health
Serious Mass isn't just about the calories—it’s about quality nutrition. This formula is fortified with 25 essential vitamins and minerals, including Vitamin C, Vitamin D, and Zinc, to support your immune system while you push your body to the limit. To further enhance your performance, each serving includes Creatine Monohydrate and Glutamine, helping to improve strength, power, and muscle recovery after every workout.